<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="./js/vue.js"></script>
</head>

<body>
    <div id="root">
        <h2>今天天气很{{info}}</h2>
        <button @click="isHot=!isHot">切换天气</button>
    </div>
    <script>
        new Vue({
            el: '#root',
            data: {
                isHot: true
            },
            computed: {
                info() {
                    return this.isHot ? '炎热' : '凉爽'
                }
            }

        })
    </script>
</body>

</html>